Nicholas CourtneyForever known as the Brigadier (and thus the only ranking UNIT officer who counts), actor Nicholas Courtney dies at the age of 81, the only actor to have appeared alongside every Doctor in Doctor Who. After appearing as a one-off guest character in the Hartnell era, Courtney is drafted into the role of Colonel Lethbridge Stewart for a 1968 Doctor Who story, proving popular enough to return the following season with a promotion to Brigadier. In this role, Courtney guest starred with every television Doctor (including, thanks to a cameo in a 1993 charity skit, Colin Baker); he would also appear alonside Paul McGann in a Big Finish audio play, a medium that also saw him appearing with David Tennant, years before being cast as the tenth Doctor. Courtney would play the role for Big Finish several times, and even reprised the Brigadier in a 1995 fan-made video production, before bringing the character back in a two-part episode of The Sarah Jane Adventures.